Hell, it seems like most of the characters bastardized for vore shit are animals. TBH that only makes it more puzzling.
On the subject of weird fetishes in certain fandoms, I am/was somewhat involved in the Once-ler/Lorax fandom for a bit and as I think I've mentioned before they are by far the most fucked-up fandom I've been in. However, there was this one time one of the more popular artists drew watersports/piss fetish shit and the rest of the fandom completely lost their shit at her for it, like death wishes and everything. I mean, watersports is squicky and everything and I can understand people getting pissed about it (pun unintentional), but this is a fandom where hardcore guro was pretty much a daily occurrence that no one batted an eye at. You'd think that a bunch of people who rub the bean to children's cartoon characters being graphically disemboweled/beheaded/raped by an evil version of himself/cannibalized by an evil au version of himself/being raped by animals/raping animals/etc wouldn't be phased by some pee, but I guess sick fucks sometimes work in mysterious ways.